Short answer: the JBL PartyBox On-The-Go 2 Plus. It ranks #5 of 113 boombox speakers by sound quality, rated 4.4/5, at $349.95. The Zealot ZE21 ranks #18, rated 4.0/5, at $187.15, $162.80 cheaper, a saving that is not big enough to make up the sound-quality gap.
The JBL PartyBox On-The-Go 2 Plus is the better-sounding, lighter choice. A well balanced karaoke party speaker with clean bass, clear vocals, on-board vocal removal, an included wireless mic and a removable battery. At 14.2 lbs (6.45 kg) it weighs noticeably less than the Zealot ZE21 at 20.4 lbs (9.27 kg). Watch for: The bass has less kick and physical impact than the JBL Partybox Encore 2 or JBL Partybox Club 120, and the JBL Partybox Club 120 gets noticeably louder.
The Zealot ZE21 is the longer-running, tougher option. A rugged battery boombox with unusually deep bass, very long battery life, and stereo pairing for party scale sound. It is rated for 40 hours of battery against 15 for the JBL PartyBox On-The-Go 2 Plus. It is rated IPX6 against IPX4 for the JBL PartyBox On-The-Go 2 Plus. Watch for: That deep-bass emphasis comes with a pronounced 60-110Hz kick-bass dip and over-loud 250-600Hz lower mids, which can make rock and pop sound hollow or boxy.
Buy the JBL PartyBox On-The-Go 2 Plus. It is rated higher for sound quality, and the $162.80 you would save on the Zealot ZE21 does not close the gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 14, 2026 at 6:17 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| JBL PartyBox On-The-Go 2 Plus | Zealot ZE21 | |
|---|---|---|
| Price | $349.95 | $187.15 |
| Ranked | #5 of 113 in Boombox Size Portable Bluetooth Speakers | #18 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (JBL One app) | No |
| Aux Input | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Built-in Microphone | No | No |
| EQ | Yes (app EQ, Deep and Punchy bass boost) | Yes (multiple modes) |
| IP Rating | IPX4 | IPX6 |
| Party Mode | Yes (Auracast) | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-C, 11V/2A) | Yes (USB-A + USB-C) |
| Power Input | AC Power cord | USB-C |
| Removable Battery | Yes | - |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 14.2 lbs (6.45 kg) | 20.4 lbs (9.27 kg) |
| Wireless Microphones | Yes 1 Included | - |
| Microphone Input | No (wireless only) | - |
| Guitar Input | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, LC3 | SBC |
| Bluetooth Version | 5.4 | 5.3 |
| Amplifier Power | 100W RMS | 250W |
| Dimensions | 19.7” x 10.2” x 8.7” (501 x 258 x 221 mm) | 16.7” x 10.3” x 14.3” (424 x 262 x 363 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters | 130W subwoofer + 2x 50mm woofers + passive radiators |
| Frequency Response | 40Hz - 20kHz (-6dB, Manufacturer specified) | - |
| Digital Aux Input | Yes (USB-C) | No |
| Lights | Yes | - |
| Strap | Yes (detachable shoulder strap) | - |
| Bass Extension (-10dB) | - | 36Hz |
| MicroSD Playback | - | Yes |
| Maximum SPL | - | 116dB (Manufacturer specified) |
Where the Ratings Come From
- JBL PartyBox On-The-Go 2 Plus: reviews by GYMCADDY and Peter Tyson Audio & Visual.
- Zealot ZE21: reviews by Techder Audios, Jay’s Straight Up Reviews & More and Jagist.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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